Dust-settler.



M. J. BAKER.

DUST SETTLER.

APPLIOATION IILED'JULY 5,1912.

Patented Dec. 24, 1912.

WITNESSES:

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MARTIN J. BAKER, OF PORTLAND, OREGON.

DUST-SETTLER.

Specification of Letters Patent.

Application filed July 5, 1912.

Patented Dec. 24,1912.

Serial No. 707,951.

chines used in flour mills for collecting the fine dust particles which gather during the milling operation, in order to prevent such particles from settling about the mill.

The dust, chaff and other light particles segregated during during the milling operation is usually blown through a machine in which such particles settle, while the air with which the dust is intermixed escapes into the atmosphere' The object of my invention is to provide a machine of this character of simple constructlon, and so arranged and proportioned as to efliciently arrest the dust particles and to carry such particles to a convenient and safe place of storage.

With this object in View my invention consists in the combinations and features fully explained in the following description, and illustrated in the appended draw-.

. stant state of vibration, whereby the fine ing, of which:

Figure l is a sectional side elevation through the center of the machine, Fig. 2 is a plan View of the machine with the cover removed, Fig. 3 illustrates, in sectional side elevation, a modified form of construction, and Fig. 4 is an end elevation of part of the machine, substantially in agreement with Fig. 3.

The machine comprises a funnel shaped casing 1, closed at the top by a cover 2. The upper portion of the casing is rectangular in shape, and the lower portion terminates at the bottom in a perforated neck 3 adapted to receive a suitable tube 4. A plurality of partitions 5, 6, 7 are transversely fixed in the casing, and the cover is made with apertures 8, 9.

In operation the dust carrying air enters the casing through aperture 8, passes downward and around the bottom edge of the partition 5, thence over the top of the partition 6, around the bottom edge of the partition 7, whereupon it rises and exhausts through the aperture 9 into the atmosphere. When the mixture first enters the casing all the coarser and heavier particles are driven downward, in the direction of arrow 10, past the bottom edge of the partition 6, and into the tube 4. The finer and lighter particles pass over the top of the partition 6 and into the large space 11, from where they sink to the bottom and into the said tube 4.

The various spaces and apertures of the machine must be proportioned correctly in order to give satisfactory results. Thus the inlet 8 and the exhaust 9 must be of the same size, and the aperture 3 at the bottom substantially one fourth the size of the said apertures 8, 9, in order that the suction through the tube 4 may be merely sufiicient to carry off the solid particles of the mixture. The space 12 at the bottom of the partition 6 must also be of a certain size, substantially the same as the inlet and outlet, as otherwise, if the said space is larger, the air on entering the machine will pass clear around the bottom edge of the partition 6 and thus create an eddy current at the bottom of the machine.

The walls and the partitions of the machine are made relatively very thin, preferably of thin sheet metal. When therefore the mixture is blown through the machine, said walls and partitions are kept in a condust is prevented from settling at any point, and will be shaken into the tube 4:. The funnel shaped bottom of the machine is also instrumental in preventing the dust from settling in the machine. It is also important that the machine be substantially of the rectangular shape shown, as other shapes, as for example a cylindrical-conical casing, will cause eddy currents to form, and thereby prevent the proper working of the machine.

WVhen the atmospheric pressure remains substantially constant, and the velocity of the mixture through the machine does not vary appreciably, perfect results are obtained. But if the atmospheric pressure or the velocity show decided variations, it is desirable to embody means for adjusting the machine to such variations. This I accomplish in the following manner, as illustrated in Figs. 3 and 4.

In order to prevent rain from entering the machine through the exhaust aperture 9, a suitable cover or rain shed 13 is provided. By adjusting said cover relative to the exhaust opening the air flowing through the machine may be regulated. That is to say, if the said cover is set substantially to close the exhaust opening, then the air going through the machine is forced through the bottom tube 4, and as the cover is drawn away from the exhaust opening, the pressure is gradually relieved. The cover must therefore be so positioned that the air does not reach the lower part of the casing during its passage through the machine, so as to avoid eddy currents. As stated, the area of the space 12 is also of importance. When the pressure in the casing is regulated by adjusting the exhaust cover, it also becomes necessary to adjust the area of the said space. The partition 6 is therefore pro vided with a slidable extension 15, guided between the said partition and a pair of stationary cleats l6. Said plate is made with an operating handle 17, which extends through the machine casing. The plate 15 may thus be moved up and down to regulate the space 12*, and it is fixed in position by a clamping screw 18.

I wish it understood that the adjustable cover 18 and theplate mechanism 15 are introduced in order to illustrate means for accomplishing the results specified, and that other equivalent means may be substituted with a view of producing a mechanically perfect machine. Finally I wish to state that while I have described my device as used in a flouring mill, it is obvious that it lends itself as readily for use in any build ing where the removal of dust particles is required.

I claim:

1. In a device of the character described,- a casing having inlet and exhaust pipes at the top and a small exhaust at the bottom, means for obstructing the passage of the dust-laden air through the casing, said means including a partition dividing the easing into two chambers leading into said bottom exhaust, means for adjusting the outlet area of the first chamber into the said bottom exhaust, and means for adjusting the top exhaust; both adjusting means operable from the exterior of the casing.

2. In a dust settler, the combination with a rectangular casing tapering downward and having a perforation at the bottom, transverse partitions in said casing, one of said partitions dividing the lower portion of the easing into two chambers extending to said perforation, and a removable lid carrying inlet and exhaust pipes; of means for adjust-ing the area of the outlet of the first chamber into said perforation; and means for adjusting the exhaust area in the lid;

both of said adjusting means operable from the exterior of the casing.

3. In a dust settler, the combination with a rectangular casing having a pyramidal, perforated bottom; of a series of transverse partitions in said casing for. directing the flow of the dust-laden air; cleats at the bottom of one of said partitions; a plate mounted to slide in said cleats; and means for securing said plate in adjusted position, said means operable from the exterior of the casing.

4:. In a dust settler, the combination with a casing tapering down to a small bottom outlet and a removable lid carrying inlet and exhaust pipes; of a pair of transverse partitions substantially abutting said lid; an intermediate partition positioned to leave air-spaces at the top and bottom; a plate positioned adjacent to the bottom portion of the said intermediate partition; cleats in the casing for guiding said plate; an operating rod extending from said plate through the casing; and means on the exterior of the casing for securing said rod in adjusted position.

In testimony whereof I have hereunto af- 7 fixed my signature in the presence of two wltnesses.

MARTIN J. BAKER.

Witnesses J. A. BAoKsTRANn, DAVID E. LOFGREN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Batents,

Washington, D. G. 

